Three-Dimensional Observation on the Liquid Emptying Process from a Scaled-up Gravure Cell

C.-C. Lee; S.-H. Hu; T.-J. Liu; C. Tiu

doi:10.3139/217.2483

Article

Three-Dimensional Observation on the Liquid Emptying Process from a Scaled-up Gravure Cell

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Published/Copyright: April 6, 2013

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From the journal International Polymer Processing Volume 27 Issue 1

Abstract

The performance of gravure coating is strongly dependent on the break-up of the liquid bridge connecting the surfaces of the moving roller and gravure cell. The mechanism of the movement and subsequent break-up of the liquid bridge were studied experimentally using a three-dimensional flow visualization technique. Three stages of liquid motion were observed, and two characteristic lengths were defined to quantify the liquid pick-out and bridge break-up. The pick-out and break-up mechanisms were influenced by the capillary number, coating gap and the geometry of the gravure cell. A universal correlation between the pick-out and these variables was found.

^∗ Mail address: Ta-Jo Liu, Department of Chemical Engineering, National Tsing Hua University, Hsinchu, Taiwan 30043, ROC. E-mail: tjliu@che.nthu.edu.tw

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Received: 2011-03-02

Accepted: 2011-08-01

Published Online: 2013-04-06

Published in Print: 2012-03-01

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https://doi.org/10.3139/217.2483